console.log('hello javascript')
// console.log('霹卡')

let age = 3.14;//=int age = 10（javascript）不用定义类型
// age = age+3;

let isStudent = false
let msg = 'hello'
console.log(isStudent)

if(age === 10)//同类型，同数值同时比较。平常记住写三个等号;不等于的话是！==
    {
        console.log('child');
    }
    else
    {
        console.log('no child');
    }
let age_num = parseFloat(age)
console.log(age*4)
for(let i = 0;i<=10;i++)
    {
        console.log(i)
    }
let j = 0;
while(j<10)
    {
        
    }